All Sofa King formulations are
manufactured in the United States for quality and consistency
by degreed chemists using only the finest raw materials: USP Kosher
Glycerin, USP Kosher Propylene Glycol, and USP Grade Levorotatory
Nicotine. All materials are independently tested for purity before
use in manufacturing. They use no diacetyl, acetyl propionyl, or
acetoin in any of their products. Their e-liquid is also kosher
certified.

They routinely analyze their
finished e-liquids, for their purity, safety and consistency in
their own in-house A2LA accredited ISO 17025 Analytical Lab, but
they don’t stop there. They also send grab samples of finished
product to certified independent third party laboratories for full
analyses. They care about the quality of their fluids and make that
extra effort so you can be assured of a clean, safe
product.